He only has a subwoofer setup, but I'd like him to get the best he can for his limit. I was looking at this pioneer unit
http://www.crutchfield.com/S-zcB8KLAmkZx/cgi-bin/ProdView.asp?g=300&tab=detailed_info&i=130DEHP490#Tab

or this Alpine unit:
http://www.crutchfield.com/S-zcB8KLAmkZx/cgi-bin/ProdView.asp?g=300&I=500CDE9881.